WEBVTT 00:04.700 --> 00:09.620 Hello everybody and welcome back in this election we are going to talk about constraining the K the 00:09.620 --> 00:17.090 inversed kinematics because when you apply auto I k to any of your rigs you will find that it ignores 00:17.090 --> 00:19.370 the bone constraints you have currently put in. 00:19.370 --> 00:24.380 Now this can be a little bit infuriating but when you set something up it's absolutely fine to have 00:24.380 --> 00:25.700 those bone constraints in place. 00:25.700 --> 00:31.130 In fact if we have a quick look at the bone rates on any of the bones that are green that means they've 00:31.130 --> 00:34.440 got a bone constraint on them to grow to the bone itself. 00:34.880 --> 00:39.110 Sorry next tab along the bone constraints and select one of those. 00:39.170 --> 00:44.580 We actually have some values that we've gone ahead and set up and we can reuse those when we want to. 00:44.810 --> 00:48.920 And we've got minus 45 as a minimum and 120 is. 00:48.940 --> 00:53.320 In fact I'm going to make this a little wider so we can see everything and dismiss salthill shelford 00:53.330 --> 00:54.860 properties panel and clay. 00:54.870 --> 00:58.480 So how do we go ahead and constrain the movement of the AK. 00:58.490 --> 01:03.680 Because at the moment we can do all sorts of stuff that breaks the rules that we had before. 01:03.680 --> 01:10.730 The only thing we do have going is if we go to the bone itself we have put a transform lock and that 01:10.730 --> 01:14.330 does help in its movement somewhat and prevents. 01:14.390 --> 01:17.360 That's to say it moving in the wrong place. 01:17.390 --> 01:23.510 So we have got some control over there that does stick in place but we want it to be a bit more controlled 01:23.720 --> 01:25.230 in terms of the case. 01:25.280 --> 01:31.910 Now we do that under the bone tab or it's each bone individually and we scroll down and we need to be 01:31.910 --> 01:38.980 imposed modes he will need to make sure you are in Post mode and there is a tab called inverse kinematics. 01:39.440 --> 01:44.950 Now when we go to that we will see that it is greyed out and that can be a little bit annoying at first. 01:44.960 --> 01:46.100 We start getting there. 01:46.190 --> 01:50.480 But what we need to do in order to bring that back is we need to add a different type of constraint 01:50.750 --> 01:51.350 to the bone. 01:51.350 --> 01:54.010 So we'll focus on this top one here at the moment. 01:54.080 --> 01:58.140 So going to add a bone constraint and inverse kinematics. 01:58.280 --> 02:03.500 Now we're not going to touch any of the other points in here at the moment but what we can now do is 02:03.500 --> 02:09.320 go back to the bone and we can see the inverse kinematics is now basically not greyed out. 02:09.320 --> 02:15.650 We can start changing things so we can put a limit on the movement of X Y and Z if we want and we see 02:15.650 --> 02:18.380 we get a pretty pattern starting to appear. 02:18.380 --> 02:24.350 Now we don't know quite at the moment which ones were going to be limiting or locking down on preventing 02:24.350 --> 02:29.810 movement on and we can do trial and error if we want and we can see here that we do have this sort of 02:29.840 --> 02:36.560 envelope that's come around our our shade here our lampshade and it tells us how far we're going to 02:36.560 --> 02:37.750 be able to move it. 02:37.850 --> 02:43.190 Now in order to do this instead of just moving the head itself off the lamp we often go ahead here and 02:43.190 --> 02:47.710 just press after rotate then we can see it can pretty much move around freely. 02:47.720 --> 02:51.530 We don't want it to do that we don't want it to go backwards on itself. 02:51.530 --> 02:52.650 So let's go ahead here. 02:52.670 --> 02:55.410 This is a crazy amount of movement. 02:55.430 --> 03:00.760 It's got something to set it's zero and zero on X Y and Z. 03:00.890 --> 03:03.780 I'm just using habits of go through these fields. 03:03.830 --> 03:08.240 So the first thing is I saw there that Z seems to go around this way. 03:08.300 --> 03:10.250 So let's go ahead and do that let's go. 03:10.250 --> 03:16.960 I don't know 60 degrees one way so minus 60 to 60 and that gives us a blue arc on our screen. 03:17.310 --> 03:21.570 Okay so what was the other way if a fossil red there which would be x. 03:21.590 --> 03:25.600 Let's do this from minus 60 to 60 as well. 03:25.610 --> 03:32.660 Now I go ahead and move it about we can see that it no longer decides to be a bit crazy and it sticks 03:32.660 --> 03:34.820 within its bounds as well. 03:35.090 --> 03:38.530 We can see here I can move it along that way and bring it back. 03:38.660 --> 03:44.560 And when it reaches a certain point it will just stop moving around and move the rest of the model itself. 03:44.570 --> 03:48.970 And that's a good way of starting to control and constrain your movements. 03:49.220 --> 03:54.770 Now at this point we could because we're not using it just lock the y axis all together. 03:54.770 --> 04:01.880 If we were to lock the x and z axis it would just move as one solid part as we can see here. 04:01.970 --> 04:04.630 Now you can also increase the stiffness. 04:04.640 --> 04:10.070 And this is the amounts that it will move everything else so we work the stiffness up to a value of 04:10.070 --> 04:11.170 one which we can do. 04:11.170 --> 04:13.760 It would be the same as locking it completely. 04:13.880 --> 04:18.550 But we see here it still moves almost as if it was locked. 04:18.560 --> 04:24.350 However if we lower that down it will have a dampening effect so won't move quite so freely but it will 04:24.350 --> 04:30.200 drag everything else behind it as well which gives you a more natural movement when you do that because 04:30.200 --> 04:35.660 it's very unlikely that you will want to move just the lampshade in this case by itself without the 04:35.660 --> 04:39.810 rest of the body of the lamp moving along as well. 04:40.040 --> 04:42.040 Oh and I can see one final thing here. 04:42.070 --> 04:47.260 Have inadvertently not unchecked deform on a lampshade itself. 04:47.270 --> 04:50.390 Something to make sure that all of that is saved and in place. 04:50.390 --> 04:51.090 Excellent. 04:51.110 --> 04:57.470 And now it's time for a challenge all before we go off and do that challenged just one final thing here. 04:57.470 --> 05:02.930 I've often been playing with this and I get the lamp in a funny position and I just want to get it back 05:02.930 --> 05:03.940 to it. 05:03.990 --> 05:09.330 Being static again a very good way of doing that is to press the aiki twice in this case to select all 05:09.330 --> 05:16.150 of our bones and clear the rotations and movements by going Oulton are to clear rotations Oulton to 05:16.170 --> 05:22.140 clear movements if there are any and there we go we've got our lamp back to its starting position very 05:22.140 --> 05:26.220 quick way of when youre playing with things just getting it back to the beginning right. 05:26.220 --> 05:27.790 Its time for that challenge. 05:28.910 --> 05:34.040 Okay so a nice simple challenge here I'd like you to constrain the bone so apply inversed kinematic 05:34.040 --> 05:36.260 constraints to the rest of your bones. 05:36.260 --> 05:40.980 Remember we've got the reference from the original bone constraints we had put on there. 05:41.000 --> 05:43.420 Go ahead pause video and give that a go. 05:45.190 --> 05:46.630 OK everybody welcome back. 05:46.630 --> 05:50.070 Let's go ahead now and apply those I take constraints. 05:50.530 --> 05:52.540 Okay so now we're back over in blender. 05:52.540 --> 05:57.590 I'm going to have a look at the bone constrained by I had originally over in the bone and straight here. 05:57.820 --> 06:03.520 And bear in mind that we're going to have to put an AK constraint on that as well. 06:03.520 --> 06:04.990 So let's just have a look here. 06:04.990 --> 06:08.690 We have limits of X minus 45 to 120 set X. 06:08.710 --> 06:17.380 We're going to limit it to minus 45 all the way to 120 and we can see that in how far it can move forwards 06:17.410 --> 06:18.930 and back which is great. 06:18.970 --> 06:20.290 It's not going to be able to. 06:20.380 --> 06:23.230 Well it's not going to be able to flatten itself out anymore. 06:23.230 --> 06:27.870 So here and the next bone Let's go to the bone through mine and safety and 130. 06:28.790 --> 06:32.000 And minus 80 all the way to 130. 06:32.000 --> 06:32.720 Perfect. 06:32.900 --> 06:34.040 We're going to limit it there. 06:34.170 --> 06:38.600 I'm also going to lock the Y and Z because it's not going to move on those at all. 06:38.600 --> 06:39.850 So we've got those locked out. 06:39.980 --> 06:42.670 Now this last bone Here's a bit of an oddity. 06:42.800 --> 06:48.230 We certainly don't want him bending or moving around but the transform locks themselves pretty much 06:48.230 --> 06:49.400 sorted that one out. 06:49.550 --> 06:55.660 But the one thing I have noticed is if I try and move it I get this crazy stuff happening. 06:55.790 --> 07:00.870 Well first of all I need the base to follow with it so there's a bit of parenting to do here. 07:00.890 --> 07:07.190 We've got the lamp base all by itself so I'm going to shift after it's been selected shift select the 07:07.220 --> 07:10.500 lower bone here and parent it to the bone. 07:10.700 --> 07:16.690 And that does mean that now I can move this base bone and the base will move along with it. 07:16.730 --> 07:21.470 The other thing to bear in mind here is when we go ahead and move that headlamp does something really 07:21.470 --> 07:21.680 weird. 07:21.680 --> 07:23.410 It just jumps down here. 07:23.420 --> 07:28.450 Unfortunately one of those many quirks if we grab the top here and just move it about and start moving 07:28.460 --> 07:29.510 the bottom again. 07:29.510 --> 07:32.480 We see that it no longer does that weird motion. 07:32.600 --> 07:40.040 But the head does stay still because this is the very end of the case where we place this is going to 07:40.040 --> 07:43.510 stay until it has to be dragged back further. 07:43.700 --> 07:45.080 So that's something to bear in mind. 07:45.080 --> 07:51.410 We could place this if it was a hand for instance on an object and then move the rest of the body towards 07:51.410 --> 07:52.580 it if we wanted to. 07:52.580 --> 07:54.160 So there's lots of options there. 07:54.170 --> 07:59.840 And similarly when we drag this one out we reach an end point which we can't drag it any further. 08:00.120 --> 08:00.660 Okay. 08:00.740 --> 08:01.250 There we go. 08:01.250 --> 08:01.950 Brilliant. 08:01.970 --> 08:03.850 My constraints are all in. 08:03.890 --> 08:05.830 Hope you've sorted out yours as well. 08:05.840 --> 08:11.170 Looking forward to seeing how your lamps are coming on and I'll see well in the next lecture.